Jet structure from dihadron correlations in d + Au collisions at √sNN = 200 GeV
PhysRevC_73_054903.pdf 853 KB
nuclei with mass number 190 to 219
elementary particle jets
Dihadron correlations at high transverse momentum pT in d+Au collisions at √sNN=200 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider. From these correlations, we extract several structural characteristics of jets: the root-mean-squared transverse momentum of fragmenting hadrons with respect to the jet √〈jT2〉, the mean sine-squared of the azimuthal angle between the jet axes 〈sin2 φjj〉, and the number of particles produced within the dijet that are associated with a high-pT particle (dN/dxE distributions). We observe that the fragmentation characteristics of jets in d+Au collisions are very similar to those in p+p collisions and that there is little dependence on the centrality of the d+Au collision. This is consistent with the nuclear medium having little influence on the fragmentation process. Furthermore, there is no statistically significant increase in the value of 〈sin2 φjj〉 from p+p to d+Au collisions. This constrains the effect of multiple scattering that partons undergo in the cold nuclear medium before and after a hard collision.
Physical Review C - Nuclear Physics
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American Physical Society
Copyright (c) 2006 The American Physical Society.
Graduate School of Science